<template>
  <div class="cart">
    <h4>全部商品</h4>
    <div class="cart-main">
      <div class="cart-th">
        <div class="cart-th1">全部</div>
        <div class="cart-th2">商品</div>
        <div class="cart-th3">单价（元）</div>
        <div class="cart-th4">数量</div>
        <div class="cart-th5">小计（元）</div>
        <div class="cart-th6">操作</div>
      </div>
      <div class="cart-body">
        <ul class="cart-list" v-for="good in cartList" :key="good.id">
          <li class="cart-list-con1">
            <input
             type="checkbox" name="chk_list" 
             :checked = "good.isChecked === 1"
             @input="singleChecked(good.skuId,good.isChecked === 1 ? 0:1)"
             />
          </li>
          <li class="cart-list-con2">
            <img :src="good.imgUrl" />
            <div class="item-msg">
             {{good.skuName}}
            </div>
          </li>
          <li class="cart-list-con3">
            <div class="item-txt">语音升级款</div>
          </li>
          <li class="cart-list-con4">
            <span class="price">{{good.skuPrice}}</span>
          </li>
          <li class="cart-list-con5">
            <a href="javascript:void(0)" class="mins" @click="changeNum(good,-1)">-</a>
            <input
              autocomplete="off"
              type="text"
              :value="good.skuNum"
              minnum="1"
              class="itxt"
              @change="changeTextNum(good, $event)"
            />
            <a href="javascript:void(0)" class="plus" @click="changeNum(good,1)" >+</a>
          </li>
          <li class="cart-list-con6">
            <span class="sum">{{good.skuPrice*good.skuNum}}</span>
          </li>
          <li class="cart-list-con7">
            <a class="sindelet" @click="deleteSingle(good.skuId)">删除</a>
            <br />
            <a href="#none">移到收藏</a>
          </li>
        </ul>

      </div>
    </div>
    <div class="cart-tool">
      <div class="select-all">
         <input 
         class="chooseAll" type="checkbox" 
         v-model="allChecked" />
        <span>全选</span>
      </div>
      <div class="option">
        <a @click="deleteAll">删除选中的商品</a>
        <a href="#none">移到我的关注</a>
        <a href="#none">清除下柜商品</a>
      </div>
      <div class="money-box">
        <div class="chosed">已选择 <span>{{allNum}}</span>件商品</div>
        <div class="sumprice">
          <em>总价（不含运费） ：</em>
          <i class="summoney">{{allPrice}}</i>
        </div>
        <div class="sumbtn">
            <router-link to="/trade">结算</router-link>
        </div>
      </div>
    </div>
  </div>
</template>

<script>
import {reqCartList,
        reqCartSingleChange,
        reqCartAllChange,
        reqCartSingleDelete,
        reqCartAllDelete,
         reqAddOrUpdateCart,
        } from "@/api";
export default {
  name: "ShopCart",
  data() {
    return {
      cartList:[]
    }
  },
  mounted() {
    this.getCartList();
  },
  methods: {
    // 获取购物车列表的数据
    async getCartList() {
      const result = await reqCartList();
      // console.log(result);
       this.cartList =
        result[0]?.cartInfoList.map((item) => {
          item.isReq = false;
          return item;
        }) || [];
    },
    // 2.修改单个的选中状态
    async singleChecked(skuId,isChecked){
      // 发送请求切换
      await reqCartSingleChange(skuId,isChecked)
      // 重新发起请求
       this.getCartList();
    },
    //3. 删除单个商品
    async deleteSingle(skuId) {
      //发送删除请求
      await reqCartSingleDelete(skuId);
      //重新发送请求
      this.getCartList();
    },

    //4. 删除已经选中的所有商品
    async deleteAll() {
      //先得到所有已经选中的商品的skuId组成的数组
      const skuIdList = this.cartList.reduce(
        (p, c) => (c.isChecked === 1 ? [...p, c.skuId] : p),
        []
      );

      await reqCartAllDelete(skuIdList);
      //重新发送请求
      this.getCartList();
    },
    // 5.点击加减按钮修改商品数量
    async changeNum(good,num){
        //如果正在发送请求 则直接return不再操作
      if (good.isReq) return;

      //一旦经过看门狗,就说明现在没有请求,但是马上开始请求了,我们要设置当前正在发送修改请求
      good.isReq = true;
      // 判断如果是减少数量的话，则判断临界值
      if(num === -1 && good.skuNum <= 1) return(good.isReq = false);
      // 发送修改数量请求
      await reqAddOrUpdateCart(good.skuId,num);
      // 重新发起请求
       await this.getCartList();

      // 必须等待最新的数据请求回来,设置当前发送修改数量请求已经结束,并且拿到最新数据,下次判断就能使用最新数据判断了;
      good.isReq = false;
    },

    //6. 数量输入框修改数量的事件回调函数
    async changeTextNum(good, e) {
      //先获取用户输入的值 转为数字
      const userInputNum = parseInt(e.target.value);
      e.target.value = userInputNum;
      //先判断当前输入的内容是否是纯数字,如果不是则直接设置为原始值,并return

      if (isNaN(userInputNum) || userInputNum < 1) {
        e.target.value = good.skuNum;
        return;
      }

      await reqAddOrUpdateCart(good.skuId, userInputNum - good.skuNum);

      this.getCartList()
    }
  },
   computed: {
    //计算商品的总数量
    allNum() {
      return this.cartList.reduce((p, c) => p + c.skuNum, 0);
    },
    //计算商品总价钱
    allPrice() {
      return this.cartList.reduce((p, c) => p + c.skuPrice * c.skuNum, 0);
    },

     //商品的全选状态
    allChecked:{
      get(){
         return this.cartList.every((item) => item.isChecked === 1);
      },
      async set(value){
        //获取所有商品的skuId组成的数组
        const skuIdList = this.cartList.map((item) => item.skuId);
        await reqCartAllChange(value ? 1 : 0, skuIdList);

        //重新发送请求
        this.getCartList();
      }
    }
   },
};
</script>

<style lang="less" scoped>
.cart {
  width: 1200px;
  margin: 0 auto;

  h4 {
    margin: 9px 0;
    font-size: 14px;
    line-height: 21px;
  }

  .cart-main {
    .cart-th {
      background: #f5f5f5;
      border: 1px solid #ddd;
      padding: 10px;
      overflow: hidden;

      & > div {
        float: left;
      }

      .cart-th1 {
        width: 25%;

        input {
          vertical-align: middle;
        }

        span {
          vertical-align: middle;
        }
      }

      .cart-th2 {
        width: 25%;
      }

      .cart-th3,
      .cart-th4,
      .cart-th5,
      .cart-th6 {
        width: 12.5%;
      }
    }

    .cart-body {
      margin: 15px 0;
      border: 1px solid #ddd;

      .cart-list {
        padding: 10px;
        border-bottom: 1px solid #ddd;
        overflow: hidden;

        & > li {
          float: left;
        }

        .cart-list-con1 {
          width: 4.1667%;
        }

        .cart-list-con2 {
          width: 25%;

          img {
            width: 82px;
            height: 82px;
            float: left;
          }

          .item-msg {
            float: left;
            width: 150px;
            margin: 0 10px;
            line-height: 18px;
          }
        }

        .cart-list-con3 {
          width: 20.8333%;

          .item-txt {
            text-align: center;
          }
        }

        .cart-list-con4 {
          width: 12.5%;
        }

        .cart-list-con5 {
          width: 12.5%;

          .mins {
            border: 1px solid #ddd;
            border-right: 0;
            float: left;
            color: #666;
            width: 6px;
            text-align: center;
            padding: 8px;
          }

          input {
            border: 1px solid #ddd;
            width: 40px;
            height: 33px;
            float: left;
            text-align: center;
            font-size: 14px;
          }

          .plus {
            border: 1px solid #ddd;
            border-left: 0;
            float: left;
            color: #666;
            width: 6px;
            text-align: center;
            padding: 8px;
          }
        }

        .cart-list-con6 {
          width: 12.5%;

          .sum {
            font-size: 16px;
          }
        }

        .cart-list-con7 {
          width: 12.5%;

          a {
            color: #666;
          }
        }
      }
    }
  }

  .cart-tool {
    overflow: hidden;
    border: 1px solid #ddd;

    .select-all {
      padding: 10px;
      overflow: hidden;
      float: left;

      span {
        vertical-align: middle;
      }

      input {
        vertical-align: middle;
      }
    }

    .option {
      padding: 10px;
      overflow: hidden;
      float: left;

      a {
        float: left;
        padding: 0 10px;
        color: #666;
      }
    }

    .money-box {
      float: right;

      .chosed {
        line-height: 26px;
        float: left;
        padding: 0 10px;
      }

      .sumprice {
        width: 200px;
        line-height: 22px;
        float: left;
        padding: 0 10px;

        .summoney {
          color: #c81623;
          font-size: 16px;
        }
      }

      .sumbtn {
        float: right;

        a {
          display: block;
          position: relative;
          width: 96px;
          height: 52px;
          line-height: 52px;
          color: #fff;
          text-align: center;
          font-size: 18px;
          font-family: "Microsoft YaHei";
          background: #e1251b;
          overflow: hidden;
        }
      }
    }
  }
}
</style>
